Just before the latest serial number system, the following format was used:

Sample Serial Number "CCMP8281M81G-A1"

Built in "M" Model Year"81" 1981"G" Production Month (A=August, B=September...) February 1981"A-1" Second Quality.

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For boats that are older than 1973, a four digit number was used. the number was stamped into the forward plyon post on the outboard side. The plyon posts are what the trampoline is supported by above the hulls.